diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 3f78ebbb795f..ab28666956d0 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -2510,6 +2510,8 @@ static long do_pagemap_cmd(struct file *file, unsigned int cmd,
 
 	switch (cmd) {
 	case PAGEMAP_SCAN:
+		if (!mm)
+			return -EINVAL;
 		return do_pagemap_scan(mm, arg);
 
 	default: